The problem with steel is, it work-hardens and becomes brittle. Anything that can do that, won’t work for long. The seas are never still, which is why boats tie-up with some sort of padding in between.

Add that salt water is highly corrosive and water is, itself, considered the “Universal Solvent” and you have the un-making of whatever attachment system you intend to use, long-term.

Not shooting-down the idea, itself, just the currently available materials.